Lifting device



L. WILKINSON.

LIF'IIIIIG DEVICE. APPLICATION HLED MAR. 2,'1921.

Patented May 23, 1922.

2 SHEETS-SHEET l.

L. WILKINSON. LIFTING DEVICE. APPLICATION FlLED MAR- 2, 192i.

1,417,436. Patented May23,1922.

2 sHEETs-sHEET 2'.

w/rA/ESSES 1 L@ Wil/asan,

TTURNEYS TTS PATENT LEE WILKINSON, 0F SO'UR LAKE, TEXAS.

LIFTING DEVICE.

-To all whom t may cof/wem:

.elevating pipes in wells.

AAn important object of this invention is to provide a device of the character described, embodying a pair of gripping sections having novel means whereby the same may be detachably secured to a well pipe so that the well pipe may be either raisec or lowered without the possibility of the device becoming accidentally disconnected'.

The invention forming the subject matter of this application has novel means whereby the sections are spread as the locking means for the same are moved to their inoperative positions.

A further object of the invention is to provide a device of the class described which is simple to attach, of highly simplified construction, and cheap to manufacture.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevation of the improved device in use,

Figure 2 is a plan view of the saine,

Figure 3 is an enlarged side elevation of the device applied,

Figure 4 is a side elevation of a latch embodied in the invention,

Figure 5 is a detail sectional view taken on the line 5-*5 of Figure 3,

Figure 6 is a vertical transverse sectional view taken on the line 6-6 of Figure 3.

In the drawings wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numerals 10 and 12 designate a pair of co-acting semi-circular sections provided with aligned hinge barrels 1d through which a hinge pin 16 is extended for liingedly connecting the sections.

rlhe other ends of the sections 10 and l2 are formed with radial extensions 17 and Speceation of Letters Patent. Patented play 23 1922 Application led March 2, 1921.

Serial No. 449,015.

18 which are adapted to be detacliably connected when it is desired to lock the sec `tions 10 and 12 about a well pipe 20.

.The means employed for locking the ra dial extensions 17 and 18 includes a diskshaped latch 21 having a centrally arranged opening 22 through which the shank of a pivot element 24 is extended. The pivot element 24 is also extended through the radial extension 17. As illustrated in Figure 4, the disk-sliaped latch 21 is provided with an extension 26 with which a transversely extending keeper 28 is connected. The keeper 28, which is connected intermediate its ends to the extension 26, is provided with depending lugs 30 which engage the outer sides of the extensions 17 and 18 and thereby hold the extensions together. Vhen the lextensions 17 and 18 are thus held together, the semi-circular sections 10 and l2 will be held in position about the well pipe so that the well pipe may be raised or lowered as desired.

.A handle 33 extends upwardly from the disk-shaped portion of the latch and forms the means whereby the latch may be rotated on the pivot element for swinging the de pending lugs 3() to theiroperative and inoperative positions. Of course, when the handle 33 is rotated in a clockwise direction to the limit of its movement, the ,depending lugs 30 will be engaged on opposite sides of the extensions 17 and 18 and the body portion of the keeper 28 will be received within recesses in the adjacent portions of the sections 10 and 12 so that the surface of the keeper will be flush with the upper ends of the sections 10 and 12.

An arcuate-cam 36 is formed integral with the disk-shaped latch and extends laterally from the same, so as to contact with a shoulder 37 formed on the extension 18 whereby when the disk-shaped latch 21 is rotated in an anti-clockwise direction, the extensions 17 and 18 will be spread thereby separating the sections 10 and 12. The inclined edge of the cam 36 merges into the adjacent surface of the disk-shaped latch 21 so that there will be no obstacle to prevent the rotaion of the latch in an anti-clockwise direcion.

ioo

As illustrated in Figures 2 and 3, the exi Side oit' the well, and so as to form gripping devices whereby the hand may be securely engaged with the sections 17 and 18, when adjusting the device. i

In attaching the device to the pipe 20 semi-circular sections l and 12 are arranged on opposite sides of the saine and the weight of the manipulating lugs 33 and the keeper 28 will rotate the latch 21 in a clockwise direction and the lugs 28 will be engaged with the ears 17 and 18 whereby the sections and l2 are locked about the pipe. i As illustrated' in Figure 8, the coupling at the upper end of the pipe 20 contacts with vthe keeper 28 and thereby lirmly holds the saine in position so that sections 10 and 12 Vwill be securely locked about the pipe during the elevation of the pipe and no obstacles which the device may strike willserve to unlock the device.V

With reference to the foregoing description it will be observed that the rotation oi the latch in an anti-cl0ckwise direction will unlock the sections 10 and 12 and will simultaneously spread the saine, so that the device may be disconnected from the pipe.

Having thus described the invention,

i what is claimed is:

1. A device 0i the character specified corn prising hinged connected sections having radial extensions, and a latch oi' disk shaped formation arranged between the sections and pivoted to one of the sect-ions, saidy latch being provided with a laterally projecting arcuate cam adapted to engage one oi' the sec` tions whereby to separate the sections when the latch is rotated in one direction. l l

2. A device of the character speciiied coniprising a pair of hinged connectedsections having radial extensions, one ofvsaid extensions ybeing provided with a shoulder, a latch of disk shaped formation rotatably connected to one of 'said sections and having its periphery provided with a laterally projecting arcuate cain adapted to engage said whereby to separate the sections, and a lifting device associated with said sections.

4. A device 0i the class described, `coinprising a pair of hingedly connected sections having extensions, a disk vshaped latch rotatably connected to one of said sections and having` a keeper adaptedior engaging said sections, a handle connect-ed to the periphery of said latch, and an Varcuate cain extending laterally from said latch and adapted 'for engaging the terminal portion of one of said extensions.

5. A device of the class described, coinprising a pair of semi-circular sections, provided with radial extensions having gripping devices, a disk-shaped latchrotatably connected to the inner side of one of said extensions and provided with a keeper hav` ing depending lugs adapted to engage on opposite sides of said extensions for locking the extensions together, said latch being provided with a laterally projecting arcuate cam having a beveled edge adapted to engage one of said extensions for'nioving the saine outwardly, and a lifting device connected to said sections.

Y LEE WILKINSON. 

